Scroll-sawing machine



(No Model.) 3 Sheets-Sheet l J. LAIRD. SCROLL SAWING MACHINE.

No. 444,071. Patented Jan.6,1891.

'ma noms persas co., mom-uws., wlsumawu, u. c.

(No Model.) J LAIRD 3 sheets-sheet 2. SCROLL SAWING MACHINE.

No. 444,071I

Patented Ja,11.6, 1891.

(No Model.)

J. LAIRD.

3 Sheets-Sheet 3.

SCROLL. SAWING MACHINE.

Patented Jam, 1891.

AM111...A

UNITED STATES PATENT EEIcE.

JAMES LAIRD, OF PATERSON, NE JERSEY.

`SCROLL-SAWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 444,071, dated January 6, 1891.

Application filed April 9,1890. Serial 110.347.286. (No model.)

To all whom it may concern.:

Be it known that I, JAMES LAIRD, of the city of Paterson, county of Passaic, and State of New Jersey, have invented a new and useful Improvement in ScrollSawing Machines, of which the following is a specification.

The object of my invention is to provide a scroll-sawin g machine so constructed that the person operating the same may turn and guide the saw, moving itin any direction While sawing without moving the wood or other substance which is being sawed.

Theinvention consists of a main fram e, asawframe, and an intermediate swinging frame connecting the two. One end of the intermediate frame swings on centers in lugs cast on the inner side of the main frame and on the other end of the intermediate frame are centers on which the saw-frame swings at right angles, a gripping device of peculiar construction for holding the saw, and a device for guiding the saw while in operation, all in combination with the series of levers, connectin g-rods, hollow centers, ball-and-socket joint, treadle, driving-wheel, and pulleys, hereinafter more fully described and set forth.

In the accompanying drawings, in which similar letters of reference indicate like parts, Figure 1 is a side elevation of saw. Fig. 2 is a plan of same. Fig. 3 is a section detail of saw-connection. Fig. 4 is a part back view of frame. Fig. 5 is a detail part section of grip closed; Fig. 6, detail of grip, part section, open to release saw. Fig. 7 is a part elevation of back of frame, showing levers depressed, crank loclied, &c., in releasing saw- 5 blade.

A is a standard, pivoted to which at E is a treadle F, provided with pitman D9, engaging at its other extremity a crank Cin the usual manner. On the frame A is located in suitable bearings a shaft or arbor havinga crank C on the inner end and on its outer end a band-wheel B, from which a band or cord B2 is carried over the pulley B', which is located on a similar arbor journaled on the standard A, and having at its inner end a crank-disk D, with similar crank, and is provided on its periphery with a notch K2, which is made to correspond with'the hook end K of the lever K. Lever K is secured loosely to the frame A in a suitable position by the pin K5. The other end of the lever K at K3 is connected by a rod K1 to the treadle G30, secured to the door or other suitable location in the usual manner.

On the inner side of the standard A, and swinging on centers a2 a2, which are screwed into lugs cast on the standard A, is a frame a. On the other end of frame a are centers @31 and w32, on which the saw-frame a swings at right angles to the frame a. (The relative positions of the frames a, and a with the standard are better shown by Fin'. 2.) On the frame a at a5 is pivoted the rocking arm a4, on the inner end of which is the ball-andsocket joint a, connecting with pitman a". The other end of pitnian is connected by crank-pin with crank-disk D. The outer end of rocking arm a4 is connected at as With sawarm b by the rod b2, which works through the hollow centers a31, and connected with the lower saw-arm b by the stiff rod hf. Rod b9 is connected to saw-arm b by a swivel-joint b5.

G22 is a toggle-joint uniting the bar G2, which is pivoted onto the end of the saw-straining lever G10, and the bar G21, which is jointed onto the thu mb-screw G5, by which to regulate the strain on the saw; but any amount of strain can be put on the saw by merely turning the thumb screw G5, which pushes down the straight toggle-bars G2 and G21, and through them acting on G and on both saw-arms and all the parts connecting them through pivot Z913. The rod G3, fastened to the frame a', the rod G9, connected to the toggle-joint, and the rod G are all connected in a ring G8.

k is a pulley, and k2 is a spring to draw back to toggle-lever,

7a is a cord connecting the toggle-joint with the spring 7a2.

Rod G of straining device and rod K4 of stop-lever K are both attached to treadle G for the purpose of stopping the machine and opening the grips to release the saw, as afterward described.

The saw-arm b at L12 is pivoted in the eX- tension @21, and fastened to frame a by setscrew a3. The lower saw-arm b is pivoted at 1213 to the straining-lever G10,which is pivoted to frame a at G11. Pivoted at G31 is a lever G, having an expansion-spring g acting be- IOO tween it and the lever b so as to keep them forcibly apart. Lever G has also a pin at G wolkingin slotted guide G7,and,beingcollared onto the neck of cup d', supports it and acts as vertical guide to saw e.

The end of saw-arm b at U is forked and ineloses a collar swinging on pivots and through a holein which the rod d turns, and on which is fixcdthe lower pulley f. The end of upper saw-arm Z) at b4 is similarly provided with collar. The rod b3 passes through collar on point of saw-arm I) at b1 and is then passed through a hole in a button or nut above the collar. Said button or nnt is provided with a thumb-screw, by which it can be fastened at any distance up or down on rod 'b3 to suit saws of different lengths. Rod Zcan bcpushed way up, so as to allow saw to be withdrawn from work. The lower end of rod lf is attached to upper saw cross-head e2 at a point c. 'lhe saw c in lower end of cross-head is fixed by a set-screw` ci. The cross-head c2, being round, slides freely up and down in guidetube c7, which has a slot going nearly its whole length to receive a feather c, iixed on crosshead e?. The guide-tube cT turns freely in a round hole in saw-frame a', and also in one in bracket e4, which is bolted on frame a. The guide-tube e7 has fixed to it a pointer e3 to indicate the direction of cutting-face of Saw.

The handle e', of which the pulleyf is a part, fits easily into the space between the frame u" and the bracket cl. Handle c has a' hole in it the whole of its length,into which is fitted the guide-tube c7, both being temporarily iixed together by a pinclrscrew through the handle c. Now the saw e, being allowed free motion vertically, is carried around along with the handle e' and guide-tube e7, in the slot of which the feather cQ on crosshcad c2 slides lengthwise.

Figs. 5 and 6 show the grip or clamp dholding the lower end of saw c.

d2 is the end of lever G, collared onto thc neck of cup d.

d5 are pivots connecting levers di with links d5.

d" and (Z9 are pivots riveted into the plate d, on which the levers di work.

(lm are pins riveted into the plate d, on which the heels of steel jaws (Z3 rest.

d is a sleeve connected with grip-plate d, and in which the rod d slides. c

Fig. 5 shows the clamp or grip closed on jaw. Fig. G shows clamp or grip opened for the removal of saw.

The steel jaws d rest loosely on the pins dl and between the points of levers all, and are kept in their places by the cover du, Fig. 4.

Fig. 2 shows the relative position of the standard A with regard to the saw-f rame a a. By the side of saw-frame c is a table ll, on which to rest the board to be sawed. On the end of lever lli2 at Il on the table H is a pad for holding down firmly the board to be sawed.

ll .is fulcrum of lever ll?.

At lll is a hole in the table, through which passes a rod, connecting pad-lever with a spring fixed on the lfloor and operated by a hand-lever below the table.

Fig. 4 represents a and ct in position and the saw under strain.

\Ve will now proceed to describe the method of removing and replacing the saw. The board to bc sawed, having a hole pierced in one end of it, is now placed under the pad l l of' the table ll, with the hole end projecting toward the saw. The Sawyer now puts his foot on treadle G3, to which is connected rod K4 of vstop-lever K and rod G of straining device, and the stop-lever K, the crank-disk l), the pitman o7, the rocking lever al, the sawarms b b', the lever G, and the toggle-bars G2 and GQ, with all their connections, are in positions prior to opening the grip and relieving the saw as represented in Fig. et. The Sawyer now pushes the trcadle G30 down and everything assumes the positions shown in Fig. 7. rlhe rod K4 draws down the end of lever K at Ki", drawing the hook end of lever K at K into the notch K2 of the crank-disk D, stopping the machine and holding it firm till thc saw is withdrawn and replaced again. The treadle G30, acting on rod G', at the same time pulls down the ring GS, attached to rods G3 and G9. The rod G3, being fixed to sawtable d, draws the toggle-joint G22 inward and upward, and straining-lcver il", being pivoted to saw-frame u. at G11 and at the other end of toggle-arm G2, is also drawn up, raising with it the saw-arm Z1 by pivot b1. The saw-arm b', being kept down by the stift rod b", has all its upward motion thrown into the end lfg of saw-arm L', which, being collared onto the neck of rod (i12, pushes it up through sleeve d, and, being by pivot df connected to linksclS and at d5 to levers (ZT, thereby pushes them back from jaws cli. .laws d" fall back on pins di, allowing the saw e to be withdrawn, which is done by taking hold of the rod b3 with the hand and pushing it up through thecollar at L* till the saw is clear of the work. The board to bc sawed is now placed under the pad Il on table H, with the hole end projecting toward the saw-table a, Fig. 2. Then taking hold of the handle c with the finger and thumb swing the sawtable ai right under the board to be sawed with its hole right over the cup CZ', Fig. 5. Then take hold of the saw-blade and drop it into the hole in the board and into the cup, which will lead it in between the jaws of the grip, Fig. (J. The foot is now to be removed from the treadle G30, Fig. l, when the spiral spring (i2 on stop-lcvcr K will disengagc it from notch K"2 on the disk D, as will also the spring k2 on frame a', acting over pulley 7a, draw the togglc-bars back into their upright position, pushing down straining-lever G10, which, acting on saw-arm b through pivot bis, draws down the end of saw-arm b at ha, and with it the rod d, which, sliding in sleeve d on grip-plate d, and being pivoted at d to IOC) IIO

Iso

turn the saw at both ends in the same direc-- tionA without twisting the saw-blade. The compressed spring g', connecting the saw-arm h with the lever G, acting forcibly between the supporting-neck of cup till the descending saw-arm b at hs draws downl the rod C112,

closing the jaws of grip on saw. The use of the lever G and the spring g is better illustrated by supposing the spring g to be taken out. The lever G would then have nothing to support it,and, being collared onto neck of cup, would of its own weight fall down, carrying with it the cup and the body ot' grip. This would relieve the jaws d3 from the pressure of the levers C17. and slacken their grip on the saw. This state of things would remain till lever G was again pushed up and its supporting-spring g replaced. The saw being passed through the board into the grip and fastened at both ends, the Sawyer, taking hold of handle e with his linger and thumb, can turn the cutting-face of saw in any direction, and by the swinging frames d and a and by leading the saw can cut any figure with the greatest ease and about three times quicker than with any other saw with which I am acquainted. This saw works easily and with very little noise, having no springs on saw-arms to overcome and very few joints that will ever require adjusting. It can be driven at great speed, and the saw canbe replaced and removed in a few seconds.

Any kind of power may be employed to operate my scroll-saw and a board of any length may be sawed, and the width of the range of the saw in all cases is equal to the length of the intermediate swinging frame, backward or forward, on which the saw-frame swings.

Fig. l of the drawings, which form a part of my specification, shows a drilling or boring' device on the same arbor or shaft that carries the disk D, and by the side of the pulley B is a larger pulley, which is grooved also, and is connected with a band or cord D2 to a small pulley D', which, with the pulley D3, is located on an arbor journaled in the upper part of the frame A. On the same arbor is loosely balanced an arm D", provided with a drill-spindie D7, pulley D5, bands DS, andan operatinghandle D6. v

Vith this description of my invent-ion, what I claim is- 1. In a scroll-sawing machine, the combination of frames, a primary frame A, fixed, from which motion is conveyed to an intermediary swinging frame d and thence to a swinging frame 0,', carrying the saw, the last-mentioned two frames swinging on the centers d2, (12,0031, and @32, (solid,) in combination with the endless cord, or chain f2, passing around pulleys f f and f f', for the purpose of guiding and, in conjunction with the handle e,oi` turning the saw and enabling the person operating the saw to cut any desired figure without moving the board or other material which is being cut or sawed, the whole vbeing constructed substantiallyas shown and described, for the purposes set forth.

2. The combination of the frames A, a, and d', the grip d, lever G, the toggle-straining 1evers G2 and G21, acting on the shank of the grip through the lever G10, which again acts on lower saw-arm h', loosening the grip on the saw to permit Vits withdrawal from or insertion into the grip in conjunction with the driving mechanism, all constructed substantially as described, and for the purposes speciiied.

JAMES LAIRD.

Witnesses:

WILLIAM M. DREW, ANDREW MOOAN. 

